Improvement in key-hole guards



NITED STATES PATENT Trice.

`Janine r. BODTKER, or CHICAGO, ILLINOIs.

"figlivlPRoveMENT |N KEY- HOLE cuARDs.

` Specification forming part of Letters Patent No. 103.28@ dated May 2 1870.

JZ'O a/Zl whom it 111,603/ concern,.- i i Be it known that I, JAMES, F. Boorman, of Chicago, in the county of Cook and State of `Illinois,have invented a new and useful Key- Hole Guard 5 f and I do hereby declare the `fol-Y lowing to be a full, clear, and exact, descrip'- tionthereof, which will enable others skilled in the art to which myinvention appertains to make and use the same, reference being had s to the accompanyingvdrawings, forming part e ofthis specification, iu which- T Figure 1 is a `perspective view of my imi proved key-hole"guard. Fig. 2 is an end view of thesame; and Fig. Bis a side view, showing its application to a key-hole.

Similar letters of reference indicate corresponding parts `in theseveral figures of the e drawings.

My invention hasfor its object to provide a guard for the key-hole of door-locks. &c., for the purpose of preventing the introduction of `false keys or burglars tools to unlock the door. 1`

In the accompanying drawings, A is a block` of metal or other suitable material, of the form shown in Fig. l-thatis to say, it is, in shape,

Vtransversely of` the `key-hole to which it is to be applied. `B is a section, smaller than the part A, but similar inshape, attached to one `endof the latter by the adjusting-screw C, to which it is firmly secured. The part B may "be made separately, and eut from the part A after the `latter is formed. The guard is applied to a key-hole as shown in Fig. 3, in i which D E are sectionsof a door and lock, re-

. spectively. The door is irst locked upon the inside, and the keyremoved. The guard is then inserted in the key-hole F to the extent shown in Fig. 3, and the part B turned up by the adjusting-screw C, to bear against the inner side of the look-case, as shown at G. It is not necessary that it should be turned to this precise position, as it may be turned to almost any angle with the part A, as shown in Fig. 2, provided it bears against the lock-case or an interior shoulder formed around the key-hole. When placed in position, as above described, it lls the key-hole to such an eX- tent that a key, H, or other instrument cannot be introduced to turn the lock. Neither can the guard be pushed out, as it is locked secure] y against such a result by the part B.

In order to accommodate doors of different thicknesses, the screw C may be operated to move the part B to a greater or less distance from the part A, thereby increasing or decreasing the length of the guard.

As a modification of my invention, where the guard is to be applied to a key-hole from the outside of a door, the part B is dispensed with and a notch made in or near the lower edge of the part A, to receive a spring attached to the bolt or some convenient inner portion of the lock.

Having thus described my invention, what I claim, and desire to secure by Letters Batent, 1s-

The key-hole guard consisting of the block A, provided with a female screw-thread, and the headed screw G, having the block B firmly secured thereto, for the purpose speciiied.

JAMES F. BODTKER.,

Titnessesz WM. C. FARWELL, G. H. FROST. 

